Halftone
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Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect. "Halftone" can also
The first printed photo using a halftone in a Canadian periodical, October 30, 1869
A multicolor postcard by Jenny Nyström (1899) printed from hand-made halftone plates
This close-up of a halftone print shows that magenta on top of yellow appears as orange/red, and cyan on top of yellow appears as green.
Purple screens used in offset printing: Angles 90°, 105°, 165°
Frederic Eugene Ives
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Frederic Eugene Ives was a U.S. inventor who was born in Litchfield, Connecticut. In 1874–78 he had charge of the photographic laboratory at Cornell University. He moved to Philadelphia, Pennsylvania,
Portrait of Ives from a 1902 edition of The Inland Printer
Ives inserting a Kromogram into a Junior Kromskop, circa 1899
An Ives Kromogram issued in 1897
Advertisement for plastigrams, 1924